Honeywell T8131A User manual

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OWNER’S GUIDE

69-0887-1

T8131A,B Programmable Thermostat

Weekday/Weekend (5-day/ 2-day)

Programmable Heat and/or Cool

Low Voltage (20 to 30 Vac)

Thermostat and Mounting Plate

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Welcome to the world of comfort and energy

savings with your new Honeywell program-

mable thermostat.

By following the programing instructions in this

manual, your new thermostat will automatically

control the temperature in your home, keeping

you comfortable while saving energy.

Direct any questions concerning the application

of this thermostat to Honeywell Customer

Assistance at 1-800-468-1502, Monday-Friday

7:00 a.m.-5:30 p.m., Central time.

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Table of Contents

Page

Prepare for Installation .................................................................................................................... 5

Remove Old Thermostat ................................................................................................................. 7

Replacing a Clock Thermostat that has C or C1 Clock Terminals .................................................. 8

Install Batteries................................................................................................................................ 9

Program the Thermostat ................................................................................................................. 11

Adjust Fan Operation Switch........................................................................................................... 20

Adjust System On-Time, °F/°C........................................................................................................ 20

Mount Thermostat Mounting Plate .................................................................................................. 22

Wire Thermostat Terminals ............................................................................................................. 24

Mount Thermostat ........................................................................................................................... 28

Check Thermostat Operation After Programming and Installing..................................................... 29

Set Fan and System Switches ........................................................................................................ 31

Troubleshooting Guide .................................................................................................................... 32

Limited One-Year Warranty.................................................................................... Inside Back Cover

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RECYCLING

If this thermostat is replacing a thermo-

stat that contains mercury in a sealed

tube, do

not

place your old thermostat

in the trash. See Fig. 1. Contact your

local waste management authority for

instructions regarding recycling and the

proper disposal of your old thermostat.

If you have questions, call Honeywell

Inc. at 1-800-468-1502.

Fig. 1. Typical location of a mercury switch

in a thermostat.

M3701

MERCURY

SWITCH

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Prepare for Installation

A Check Table 1 to make sure this thermostat is compatible with your system. For more

information, call Honeywell Customer Assistance, toll-free 1-800-468-1502.

Table 1. Compatibility Chart.

System Type Compatible With T8131

Gas—Standing Pilot Yes

Gas—Electronic Ignition Yes

Gas-Fired Boilers Yes

a,b

Gas—Millivolt No

Oil-Fired Boilers Yes

a,b

Oil-Fired Furnace Yes

Electric Furnace Yes

Electric Air Conditioning Yes

Baseboard Electric (120/240 Line Volt) No

Heat Pumps/Multistage Equipment No

NOTE: Not compatible with any 120/240 volt circuit.

a

Compatible with 2-wire Honeywell zone valves. Isolating relay required for 3-wire thermostats for zone valves.

Not compatible with 2-wire White-Rodgers no. 1361 Valves.

b

Compatible with

hot water

baseboard systems. Will not work efficiently on steam or gravity systems.

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2 Acquire tools and items (below) as needed. Also purchase two AA alkaline batteries; we

recommend Energizer® batteries.

M878B

CROSS-RECESSED

SCREWDRIVER

HAND OR POWER

DRILL WITH 3/16 INCH

DRILL BIT, IF NEEDED TO

DRILL HOLES IN WALL

WIRE CUTTER/STRIPPER OR SHARP

KNIFE, IF NEEDED TO STRIP WIRES

MASKING TAPE, IF

NEEDED TO LABEL WIRES

AS DISCONNECTED FROM

OLD THERMOSTAT

LEVEL, IF NEEDED TO LEVEL

THERMOSTAT FOR APPEARANCE

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Remove Old Thermostat

A Test to make certain that your heating

and cooling systems are working

properly. If either does not work, contact

your local heating/air conditioning dealer.

To avoid compressor damage, do not

operate the cooling system when outdoor

temperature is below 50°F (10°C).

2 Turn off power to the system at the

furnace, or at the fuse/circuit breaker

panel.

3 Carefully unpack your new thermostat

and mounting plate; save the package of

screws, the instructions and the receipt.

4 Remove the cover from the old thermo-

stat. If it does not snap off when pulled

firmly from the bottom, check for a screw

used to lock on the cover.

5 Loosen screws holding thermostat to

subbase, wallplate or wall, and lift away.

6 Disconnect wires from old thermostat or

subbase. As you disconnect each wire,

use masking tape to label it with the old

terminal designation. If there are only two

wires, they do not require labeling. If

there is an extra wire that is not con-

nected to your old thermostat, you

also

will not be connecting

it to your new

thermostat. Keep the wires from falling

back into the wall by wrapping them

around a pencil as shown.

WIRES THROUGH

WALL OPENING

M5136

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Replacing a Clock Thermostat that

has C or C1 Clock Terminals?

If you are replacing a Honeywell Chronotherm®

Thermostat, you may find one or two wires that

go to the C or C1 clock terminals on the

Chronotherm® Thermostat wiring wallplate. Do

not allow them to touch, or you can damage

your transformer. Disconnect the wires and wrap

them

separately,

using electrical tape.

Do not

wrap them together

. Place the wires where they

do not interfere with the operation of the new

thermostat. Record the colors and terminal

designation labels of the remaining wires.

Six or More Wires?

If there are six or more wires (excluding clock

wires attached to terminals), you most likely

have a variation of a heat pump or multistage

system. This thermostat is

not

compatible with

such systems. If you would like information

about which programmable thermostats will

work with your system, call Honeywell Customer

Assistance at 1-800-468-1502.

Three Thermostat Wires?

If you have three wires for heating only and

can operate the fan using the fan ON switch,

this thermostat will work with your system;

however, some hot water (zoned) heating

systems have three thermostat wires. The

thermostat will not work without installing an

isolating relay on these systems. For details,

call Honeywell Customer Assistance at 1-800-

468-1502.

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Install Batteries

IMPORTANT

Batteries must be installed for pro-

gramming and operating the thermo-

stat and heating/cooling system.

A Use two AA alkaline batteries; non-

alkaline batteries will not last as long,

and can leak, causing damage to the

thermostat or the wall surface. We

recommend Energizer® batteries.

2 Make sure the thermostat is set to the

OFF position.

3 Use a coin to remove the battery door.

4 Install the fresh batteries as shown,

making sure positive and negative

terminals are oriented correctly.

5 Replace the battery door.

As the batteries are running low, a

bAt Lo

indicator flashes for one to two months before

the batteries run out completely. Replace the

batteries as soon as possible after the indicator

starts flashing. If you do not replace the bat-

teries sometime during the flashing

bAt Lo

, the

M1719C

REMOVING

BATTERY

DOOR

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indicator eventually stops flashing.

bAt Lo

stays

on without flashing to indicate the thermostat and

heating/cooling system have stopped working

and the batteries are almost completely dead.

After the batteries are completely dead, the

bAt

Lo

indicator disappears, leaving a completely

blank display.

Press down on the left ends of

batteries to remove them. If you

insert the new batteries within

20 to 30 seconds of removing

the old ones, you do not need

to reprogram the thermostat.

However, if the display is blank,

the batteries are dead or

incorrectly installed and you

need to reprogram. See

pages 16 to 19 to reprogram.

IMPORTANT

Although the thermostat has a low

battery indicator, replace the batteries

once a year to prevent the thermostat

and heating/cooling system from

shutting down due to lack of battery

power.

As a precaution, when

leaving home for longer

than a month, change the

batteries before you leave

to prevent the system

from shutting down due to

lack of battery power.

INSTALL TWO AA ALKALINE

BATTERIES AS SHOWN

M1713

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Program the Thermostat

When batteries are installed, your thermostat

can be programmed in your hand, before it is

mounted on the wall.

If you would prefer to program the thermostat

after it is mounted on the wall, go to page 22,

and return later to this programming section.

Refer to the personal Program Schedule

(pages 14 and 15) to program your time and

temperature settings for various times of the

day.

Four time periods are available during week-

days—WAKE, LEAVE, RETURN, and SLEEP.

During weekends, only the WAKE and SLEEP

time periods are available. These periods can

be seen individually on the display as you

press the Set Schedule key.

WAKE is the time period you want the house at

a comfortable temperature when you get up

and while you get ready for work or school.

When deciding what time to set for your WAKE

period, include extra lead time, depending on

the outside temperature and your furnace

response time, to give the furnace a head start

to heat the house before you get up. (This will

be a higher temperature during heating

season, or a lower temperature during cooling

season.)

LEAVE is the time period you can set for an

energy-saving temperature while you are away

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at work or school. (This will be a lower tem-

perature during heating season, or a higher

temperature during cooling season.)

RETURN is the time period you want the

house at a comfortable temperature for

activities before bedtime. When deciding what

time to set for your RETURN period, include

extra lead time, depending on the outside

temperature and your furnace response time,

to give the furnace a head start to heat the

house before you arrive home. (Again, higher

for heating or lower for cooling.)

SLEEP is the time period you can set for an

energy-saving temperature while you are

sleeping. (Again, lower for heating or higher for

cooling. For more comfortable sleeping, some

homeowners choose not to raise the cool

temperature during the night.)

You will set one schedule for weekdays and

another for weekends, because your require-

ments are probably different for each.

Fill in the times and temperatures you desire

for weekdays and weekends. If you decide not

to program the thermostat, it automatically

controls heating at 68°F (20°C), and cooling at

78°F (26°C), 24 hours a day. Also, you do not

need to enter a time and temperature program

for all periods if your schedule does not require

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it. For example, a house that is occupied

during weekdays would only require programs

for WAKE and SLEEP.

Before programming, remove the clear plastic

overlay covering the display.

When pressing the keys, use the ball of your

finger or a soft pencil eraser.

NOTE: Using sharp fingernails or pencil

points can damage the keypad.

If you make an error at any time during

programming, press the Run Program key and

continue again at the last step.

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Program Schedule

HEATING PROGRAM SCHEDULE

Weekdays Start Time Heating Temperature

WAKE

LEAVE

RETURN

SLEEP

Weekends

WAKE

SLEEP

WAKE and RETURN start times should include extra lead time, based on outside temperature

and furnace response time, to give your furnace a head start to heat the house.

The temperatures cannot be set any higher than 88°F (31°C) or any lower than 45°F (7°C).

1

2

1

2

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COOLING PROGRAM SCHEDULE

Weekdays Start Time Cooling Temperature

WAKE

LEAVE

RETURN

SLEEP

Weekends

WAKE

SLEEP

WAKE and RETURN start times should include extra lead time, based on outside temperature

and furnace response time, to give your furnace a head start to heat the house.

The temperatures cannot be set any higher than 88°F (31°C) or any lower than 45°F (7°C).

NOTE: If you decide not to program the thermostat, it automatically controls heating at 68°F

(20°C), and cooling at 78°F (26°C), 24 hours a day.

1

2

1

2

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This guide can be used for programming your new thermostat.

NOTE: Batteries are required for operation and programming. When inserting batteries, set the

system switch to OFF. Remove the battery door (on the thermostat left side) using a coin

at the bottom. Follow the instructions on pages 9 and 10.

Set Current Time/Day

To set the time, press and release once, until current time shows; to set day, press

and release again, until current day shows; then press .

Heating Program

With system switch at HEAT, press and release once. WAKE, MON-FRI and SET appear on

the display.

Set

Clock/Day

Set

Clock/Day

Time

Ahead

Back

Ahead

Back

Time

Run

Program

Set

Schedule

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Ahead

Back

Time

Warmer

Cooler

Temp

Use to program WAKE time and to program WAKE temperature for Mon-Fri.

Repeat sequence for LEAVE, RETURN, and SLEEP.

Press until SAT, SUN, WAKE and SET appear on the display. Use to program

WAKE time and to program WAKE temperature for SAT-SUN. Repeat sequence for SLEEP.

Cooling Program

With system switch at COOL, follow the same instructions as for the Heating Program.

After programming, adjust fan and system switches, as desired. Press and release to start

the program.

Set

Schedule

Ahead

Back

Time

Warmer

Cooler

Temp

Run

Program

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A quick guide for operating or making changes follows:

NOTE: Set system switch to Heat or Cool to perform the following:

Temporarily Change temperature

for current period only

—press ; TEMPORARY

indicator shows on display; this is cancelled at next scheduled change, or to cancel sooner,

press .

Hold a temperature indefinitely (such as when you are on vacation)—press , ;

HOLD appears on display; to cancel, press .

Check Current Temperature Setting—press . (When using TEMPORARILY CHANGE or

HOLD, pressing this cancels your change.)

Warmer

Cooler

Temp

Run

Program

Warmer

Cooler

Temp

Hold

Temp

Run

Program

Run

Program

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Set

Schedule

Run

Program

Check Programs—press repeatedly to see each time and temperature; then press .

Cancel a program—press until program to cancel shows; then press together.

Permanently Change a program—Repeat steps in Heating Program or Cooling Program (page 16

and 17), as applicable.

Return to normal program or start program—press .

Set

Schedule

Ahead

Back

Time

Run

Program

Questions?

Call Honeywell

Customer Assistance

1-800-468-1502.

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Adjust Fan Operation Switch

A The thermostat fan operation switch,

labeled FUEL SWITCH (see illustration on

page 21), is factory-set in the F position.

This is the correct setting for most

systems. If your system is an electric heat

system, set the switch to E. The E setting

allows the fan to turn on immediately with

the heating or cooling in a system where

the G terminal is connected.

Adjust System On-Time,

°

F/

°

C

A The thermostat on-time is factory-set for

a warm air, gas or oil heating system. If

you are installing it on another type of

system, adjust the on-time accordingly by

setting screws A and B on the back of

the thermostat. Use the heating system

table shown in the illustration (page 21)

as a guide.

Optimize the system on-time according to the

type of system to minimize room temperature

swings. Setting the screw

out one turn

means

turning the screw approximately 360° counter-

clockwise, or about one complete turn.

In the unlikely event that you want a longer

furnace on-time, readjust screws A and/or B as

follows:

First, turn in both screws completely, then

adjust for system type:

• Warm Air Furnace—set at the Hot Water

setting (A—out one turn, B—leave in).

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